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Difficulty: MediumInferences from the Text

For over a century, economic historians attributed the productivity gains of the eighteenth-century British agricultural revolution primarily to the elimination of the fallow period via the Norfolk four-course crop rotation (wheat, turnips, barley, and clover). Recent agronomic analyses, however, suggest that continuous cultivation alone was insufficient to explain the surge in grain yields. The critical mechanism was the synergistic combination of leguminous clover, which fixes atmospheric nitrogen into the soil, and turnips, which provided winter fodder that enabled year-round stall-feeding of livestock. Stall-feeding concentrated animal manure into an easily manageable and collectable fertilizer. In contrast, under traditional open-pasture systems, livestock droppings were diffusely deposited across grazing lands, resulting in substantial nutrient loss through runoff and volatilization before the manure could be incorporated into arable soil. Because nitrogen was the absolute limiting nutrient in pre-industrial cereal cultivation, the concentration and targeted application of stall-collected manure elevated soil fertility far beyond what unamended fallowing could achieve.

Which of the following can most reasonably be inferred from the passage concerning traditional farming systems prior to the widespread adoption of the Norfolk four-course rotation?

  1. A
    They were economically unsustainable because livestock routinely failed to survive winter months without access to cultivated root crops.
  2. B
    They experienced grain yield limitations primarily because farmers had insufficient total acreage to allocate toward regular fallow periods.
  3. They suffered substantial losses of potential soil nutrients because livestock waste was dispersed rather than gathered in confined feeding environments.Answer
  4. D
    They were phased out largely because nineteenth-century synthetic chemical fertilizers proved more cost-effective than fallow replenishment.
  5. E
    They were entirely devoid of any nitrogen-fixing plant species across their communal grazing lands.

Answer

Traditional farming systems lost substantial quantities of fertilizing nutrients because animal manure was diffusely deposited across pastures rather than collected and concentrated in stall-feeding environments.
The passage explicitly notes that under traditional open-pasture systems, livestock waste was deposited diffusely across pastures, resulting in significant nutrient loss from runoff and volatilization prior to incorporation into arable soil. Contrasting this with the concentrated manure collection of stall-feeding directly justifies the inference that traditional systems lost substantial nutrient value due to dispersion.

Step-by-Step Solution

1
Analyze the question stem to identify the task and target subject.
The task requires drawing a valid inference regarding traditional farming systems prior to the introduction of the Norfolk four-course rotation.
Inference questions demand identifying an unstated fact or deduction that is strictly supported by the text without outside assumptions.
2
Examine the passage's explicit statements about traditional open-pasture farming.
The author contrasts stall-feeding with traditional systems where livestock droppings were diffusely deposited, causing significant nutrient loss through runoff and volatilization.
Contrasting two systems highlights the operational weaknesses and characteristics of the earlier regime.
3
Evaluate the choices to find the statement logically entailed by this contrast.
The statement describing the loss of soil nutrients due to dispersed rather than concentrated livestock waste directly synthesizes the text's explanation of runoff and volatilization in open pastures.
This deduction adheres strictly to the passage boundaries without adding extreme qualifiers or outside information.

Key Concept

Textual inference via contrasting mechanisms in historical scientific exposition
Estimated Time:1m 15s
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Topics

Inferences from the Text

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